Cellulose derivative composition for secondary battery binder and method of preparing composition for secondary battery electrode comprising the same

A method of preparing a composition for a secondary battery electrode, the method comprising:

• preparing an aqueous solution comprising a cellulose derivative composition comprising a compound represented by the following Formula 1;
• adding an active material to the aqueous solution of the cellulose derivative and stirring to prepare a first slurry;
• and
• adding an emulsion to the first slurry and stirring:
• wherein, in Formula 1, at least one of R1, R2, and R3 is a functional group substituted with a monovalent metal (X) and comprising a phosphorus (P) element, and any remaining radicals of R1, R2, and R3 are each independently any one among a carboxymethyl group substituted with a monovalent metal (X), a functional group substituted with a monovalent metal (X) and comprising a sulfur (S) element, and hydrogen,
• the monovalent metal (X) is any one among lithium (Li), potassium (K), rubidium (Rb), and cesium (Cs), and
• “n” is an integer of 1 or more, and
• wherein the functional group substituted with a monovalent metal (X) and comprising a phosphorus (P) element is —PO3RX or —PO3X, and
• R is a hydrocarbon group of 1 to 10 carbon atoms.

A secondary battery comprising:

• a positive electrode;
• a negative electrode;
• and
• an electrolyte layer disposed between the positive electrode and the negative electrode,
• wherein the negative electrode comprises a negative electrode active material and a mixture binder, and
• the mixture binder comprises a cellulose derivative composition comprising a compound represented by the following Formula 1 and a styrene-butadiene rubber (SBR) emulsion:
• wherein, in Formula 1, at least one of R1, R2, and R3 is a functional group substituted with a monovalent metal (X) and comprising a phosphorus (P) element, and any remaining radicals of R1, R2, and R3 are each independently any one among a carboxymethyl group substituted with a monovalent metal (X), a functional group substituted with a monovalent metal (X) and comprising a sulfur (S) element, and hydrogen,
• the monovalent metal (X) is any one among lithium (Li), potassium (K), rubidium (Rb), and cesium (Cs), and
• “n” is an integer of 1 or more, and
• wherein the functional group substituted with a monovalent metal (X) and comprising a phosphorus (P) element is —PO3RX or —PO3X2, and
• R is a hydrocarbon group of 1 to 10 carbon atoms.